/Engine/Plugins/Importers/USDImporter/Source/USDUtilities/Public/USDConversionUtils.h
Copies flattened versions of the input prims onto the clipboard stage and removes all the prim specs for Prims from their stages. These cut prims can then be pasted with PastePrims.
True if we managed to cut
namespace UsdUtils { bool UsdUtils::CutPrims ( const [TArray](API\Runtime\Core\Containers\TArray)< [UE::FUsdPrim](API\Plugins\UnrealUSDWrapper\UsdWrappers\FUsdPrim) > & Prims ) }